Lab test
Diphtheria Antibody Test – Immunity Testing
Below is a plain-language overview of the diphtheria antibody test – immunity testing. This blood test checks for immunity to diphtheria, which is a serious infectious disease.
What this test is
The diphtheria antibody test measures the level of antibodies in your blood that fight the diphtheria toxin. This helps determine if you have protection against the disease, either from vaccination or past infection.
What it measures
- Diphtheria Antibody Titer — reflects the amount of protective antibodies against diphtheria
What the test involves
A healthcare professional will collect a blood sample, typically from a vein in your arm. The sample is then sent to a laboratory for analysis.
Why it is often ordered
A clinician may order this test to see if a diphtheria vaccination was effective or if a booster shot is needed. It can also be used to assess immunity in individuals who may have been exposed to diphtheria.
Preparation
No specific preparation is usually required for this test. Always follow the instructions provided by the laboratory where you will have your blood drawn.
How results are reported
Results are typically reported within a few business days and indicate the level of diphtheria antibodies detected. Reference ranges, which help interpret these levels, vary between laboratories.
Before you go
- Lab's processing time
- Specific preparation requirements
- How results will be shared
FAQ
Frequently asked questions
What is diphtheria?
Diphtheria is a contagious bacterial disease that affects the nose and throat. It can cause a thick coating in the lining of the nose or throat, leading to breathing difficulties and other serious complications.
How is diphtheria prevented?
Diphtheria is primarily prevented through vaccination. The DTaP vaccine protects against diphtheria, tetanus, and pertussis (whooping cough) in children, and the Tdap vaccine is recommended for adolescents and adults.
What do the test results mean?
The test results will show the concentration of diphtheria antibodies in your blood. Your healthcare provider will interpret these results in the context of your vaccination history and overall health.
Can I get diphtheria if I'm vaccinated?
While vaccines are highly effective, no vaccine is 100% protective. In rare cases, vaccinated individuals may still contract the disease, though it is typically less severe.
Related
Related tests
Locations
Request Diphtheria Antibody Test – Immunity Testing by state
Choose a state for local context.